sniffnoy | The difficulty ramp

Today Nori introduced presheaves and sheaves. (Well, OK, he defined them and gave an example last class, but he started actually talking about them today.) Then he went nuts with them. There was very little in that lecture I actually followed. In fact that's probably true of everyone in that class who hadn't seen them before.

...yeah, I'm going to have to spend a lot of time going over those notes...

-Harry